Percussion apparatus foe dbillinfl



(No Model.) 2 Sheets-Sheet 1.

PEROUS'SIQN-APPARATUS FOR DRILLING.

'N0.'527,078. Patented Oct. 9, 1894.

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. d afaapu (No Model.) M'AOE R 2 Sheets-Sheet 2. PERCUSSION APPARATUSFOR DRILLING.

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tented Oct. 9, 18:94.

mlllllli rrnn STATES PATENT nron.

'JAMES MAQ WAN Ross, on GLASGOW, SCOTLAND.

PERCUSSION APPARATUS FOR DRILLING.

SPECIFICATION forming part of Letters Patent No. 527,078, dated Qctober9, 1894. Application filed May 12, 1894. Serial No. 511.060- (No'model-lPatented in England March 24, 1894, No. 6,105.

i To all whom it may concern:

Be it known that I, JAMES MAOEWAN Ross, engineer, a subject of the Queenof Great Britain, residing at Greenhead Works, Glasgow, in the county ofLanark, Scotland, have invented new and useful Improvements inPercussive Apparatus for Boring, Drilling, and Like Operations, (whichhave not been patented in any country except Great Britain by LettersPatent dated March 24, 1894, No. 6,105;) andI do'hereby declare that thefollowing is a full, clear, and exact description of the invention,which will enable others skilled in the art or manufacture to which itrelates to make and use the same. a

This invention relates to percussive apparatus for drilling, boring ormining andsimilar operations; and it consists in applying as the meansfor feeding the boring or drilling tools the pressure of the air,,steamor other fluid used for operating the apparatus.

In the accompanying drawings Figure. l'is a sectional plan showing amodification of my invention in which a single feeding tube is adjustingthe position of the tool.

employed. Figs. 2 and 3 are respectively a sectional plan and elevationof another modification in which feed tubes are used. Fig. 4 shows insection a modification in which a duplex feed is provided. Fig. 5 is anelevation of similar apparatus in which is conjoined with the pneumaticfeed means for Fig. 6 is an elevation showing a convenient mode ofcarrying the operating tool, and Fig. 7 shows a hand percussive toolwith the pneumatic feed arrangement applied as acushion to prevent theconcussion of the tool being communicated to the handof the operator.

In a simple form of the improved apparatus shown at Fig. 1 the cylinderor casing A within which the reciprocating piston B is fitted is placedor extended into an outer cylindrical casing or tube 0 and on its outerend or on the outer end of the extension A is secured a cup leather orother packing D closely fitting the internal diameter of the outercasing 0. Air, steam or other fluid under pressure used to operate thereciprocating piston Bis led through a small orifice b in the piston orliner to the rear of the cup leather or other packing D and serves topress on and feed forward the cylinder A of the C is held stationary bymeans of a crosshead socket piece or clamp F jointed to it and securedby a mine prop, tripod or other means. A handing wheel G is or may besecured on the tool holder E to turn the tool E between the blows of thepiston hammer.

'In the modification shown at Figs. 2 and 3 the cylinder or casing A ofthe percussive apparatus is formed with two cylinders C 0 external toitone being on each side and parallel with the main cylinder. Thesecylinders 0 Care open at their lower ends to a space H around the toolholder or hammer which is in communication by a small orifice b with theair or steam space of the percussive apparatus; and in each cylinder isfitted a plunger rod or tube I closed at the lower end by a cup leatheror other packing D. The air or steam pressure actingon the ends of theseplungers tends to force them upward and this tendency being resisted bythe plungers I whose outer ends are connected by a crosshead F carryinga socket piece F for a prop, tripod or other fixture, the main casing Acarrying the piston hammer B and tool holder E is forced downward andserves to feed the boring or other tool E to its work.

As shown at Fig. 4 two or more tubesI, J

may be fitted one within the other in the form of telescopic plungers inorder to provide for a greater range of feed with a limited length ofthe percussive apparatus, chains 0 being provided to limit the extent ofmovement of the tubes; or the same object may be attained by securingthe feed cylinder or casing as shown at Fig. 5 in an adjustable clamp Fsothat the casing A may be moved forward at intervals as required,'theclamp being secured on a prop K as shown at Fig. 6.

When the percussive boring or drilling apparatus is adapted to be heldby a handle L as indicated at Fig. 7 the handle is fitted with plungersM fitted in cylindrical casings N formed on the main casing A of theapparatus and part of the motive fluid is admitted between the ends ofthese cylindrical casings and the ends of the plungers M to obviate orlessen concussion. 9

' Having now described the invention, what I desire to claim and secureby Letters Patent ist 1. In a percussion apparatus, the main cylinder,the drill carrier having limited move- 5 ment therein, the piston hammeradapted to contact with the drill carrier, ports for admitting fluid toreciprocate said piston, and the auxiliary cylinder and piston havingports whereby a portion of the motive fluid 10 is utilized to keep thedrill pressed constantly against the surface to be operated upon,substantially as described.

2. In combination, the main cylinder, the drill carrier having limitedmovement there- 15 in, the reciprocating piston hammer co-operating withsaid spindle, ports for admitting the motive fluid to reciprocate saidpiston, the auxiliary cylinder having constant communication with themotive fluid supply, and the rigid piston extending from the drillsupport into the supplemental cylinder, substantially as described.

In witness whereof I have hereunto set my hand and seal the 20th day ofApril, 1894.

JAMES MACEWAN ROSS. [L. S.]

VVitne-sses:

WALLACE FAIRWEATHER, C. E., Chartered Patent Agent, 62 St. VincentStreet, Glasgow.

THOS. THOMSON, Cashier, 62 St. Vincent Street, Glasgow.

